Improvement in keys



aan enna.-

H To all whom it may concern):

Be itknowu that I,- HENRY i Norwalk, in the county of Fariield and Stateof 00n- `n`ecticut, have invented a'uewImprovement in Door- `Keys; and Ido herebydeelare the follcwing,when taken `in connection .with theaccompanying drawings `and' the -letters of reference` marked thereon,tobea i `full, clear, and'V exact description of the saine, and whichsaid drawings constitute part of this specification, and representin l iFigure `1, the key complete;` .rlligure 2, the blank,preparatory tocasting the `spindle thereon; and in n Figure 3, a` section*throughthecast portiono' the 1 'spindle. A

`This intention relates to thfconstrnction of la at steel` key tooperate in that class 'of locks which is use for this class of locks. lThe inventionconsists vinfirst`.for|ni| 1g ablank for l the key fromsheet metal, withthe bow, spindle, and bit in a singlevpiece,thatfportion of the -spindle to which the, bitis attached, andwhich forms thev bearing, made less in widththan 4that required for thediameter of the spindle when complete, then placing the vblank in asuitable mold, audpouring molten metal into the mold around that portionof the stem, to `V enlarge andronnd thebit end of the spindle, so as toli form a bearing for the supportand turning the key in thelock. I

Fig. 2r epresentsthe blank.` A is `the spindle, Bthe bow, and O the bit,all in tjally the form se'en in igf2. That-.portion of the pindlefwhicliisl to form the bean'ngupon which the keyfturns, vI make lessinwidthgthan the "diameter required for thefspindle when complete,`fan`don the s ide yoppositethe' bit I cnt ing tb make thel k'ey. lighter thanthe keys in common locks,

one piece, and struckv iom sheet metal in substanfv i utwenn oF SOUTHNORWALK, coNNEcTIcUT:

The Schedule i-eixred torin thse Letters Patent and making part of thesame metai blank int'o a mold` prepared toreceive it, and so Y as toleave a space around the spindle end ofthe key,

as denoted in solid black, fig. 3.` Then into this space in the mold anysuitable metal, as 'brass or` iron in a' molten state', is poured, toenlarge or shape the bearing end of the keyinto the usual form forkeysfor this class of locks. .i f

To prevent the molten inet-al from blowing7 `aroundthe bit, I/make thenotch d upon the back side, so as to snpp'lya larger quantity of metalat that point, whichprevents 'blowing'or cold-short.

This notch is not essential, but it insures a successful cast, whichwould otherwise be uncertain.

.Removed from the mold, the spindle D, as seen 1n figfl, is inis'hedinthe usual manner, with the shoul- `(1era, and the bit is tted for thegnards'and turnblers, also in the usual manner,V

Thus I produce a Hat key, tted for-use in common at less 'expense thancommon keys arepi'o'L duced,l as the blank is 'struck from sheet metalby suitable dies, so that no uishiug is required, 'and the casting ofthe spindle in prepared molds costs much Aless than molding and castingcommon. keys, and the key itselwhen complete, is rerymuch lighter andlstronger.

I do not wish-to be understood-as broadly claiming a fiat-metalv keywith an' enlarged spindle, as such is not new;'but l I doel-aim as myinvention- As an article of manufacture', a dat metal 'key-V blank,having the spindle D cast'thcreon inthe manner substantially asdescribed. f

Witnesses: LEWIS EBEERS,

LORENZO SCQFIELD.

